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Reproductive organs, mandibular teeth, stomach contents and body measurements including total mass from white whales (Delphinapterus leucas) taken by Inuit hunters in West Greenland during 1985-1992 were analysed. Both sexes of white whales from West Greenland attain a greater length at physical maturity than do white whales from Alaska, Hudson Bay, northern Quebec, the White Sea and the Kara Sea. Male white whales attain sexual maturity at 6-7 years. Size of testes and presence of spermatozoa suggest that mating takes place in May or perhaps later.